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Subject: Re: Generic Collection
From: Georg Bauhaus <bauhaus@futureapps.de>
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Date: Fri, 11 May 2007 10:10:51 +0200
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On Thu, 2007-05-10 at 15:48 -0700, andrew wrote:
> On May 10, 2:31 pm, Simon Wright <simon.j.wri...@mac.com> wrote:

> > > So, I'm thinking that many of the "capabilities" or operations I
> > > desire of the collection would have to be "dispatching" to the type of
> > > the collection object.

When is the type of the collection object determined? How?

> > Do you want to be able to add attributes to schemas? I would have
> > thought not ..

This is an important question, if not the important question.
I'd try to answer it first.


> So I think you are saying I would have one Collection package and it
> has three procedures called Add and they operate on three different
> types:
> Tuple
> Table
> Schema

> but then how do I later use the collection package for some other
> purpose?

If you want a collection that doesn't collect either Apples
or Oranges, but instead is capable of holding Apples, Oranges,
Cabbage, Motor_Oil, Whatever, you can have that, too. Is this
what you want?


> I don't understand why I would have run-time errors.  Please expand
> that thought.

Just think of the consequences of Java pre-1.5 collections delivering
nothing but Object objects.